Fabrication of dense Cr₃AlB₄ polycrystals via pressure-assisted reactive sintering

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-05-13 DOI:10.1016/j.jeurceramsoc.2025.117532

Jan Słomiński, Sebastian Komarek, Kamil Kornaus, Norbert Moskała, Agnieszka Różycka, Dariusz Zientara, Agnieszka Gubernat

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Abstract

This research investigates the synthesis of Cr₃AlB₄, a member of the MAB phase family, using the hot pressing (HP) method. Cr₃AlB₄ exhibits a combination of ceramic-like hardness and metal-like damage tolerance, making it valuable for applications in extreme environments. However, its synthesis is challenging due to phase transitions involving precursors. The study evaluates the influence of reaction sintering and annealing time on phase formation, grain growth, and material stability.

The results show that HP yields materials with over 80 % Cr₃AlB₄ phase content, but prolonged annealing leads to its decomposition into Cr₃B₄, which causes microstructural changes and grain cracking. Cracking is attributed to the differences in thermal expansion coefficients between Cr₃AlB₄ and other phases, leading to stress accumulation during cooling. To optimize the synthesis process, the study recommends controlling grain size and using non-reactive sintering additives to limit grain growth.

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压力辅助反应烧结制备致密Cr₃AlB₄多晶

研究了用热压法合成MAB相族成员Cr₃AlB₄的方法。Cr₃AlB₄具有陶瓷般的硬度和金属般的损伤容忍度，这使得它在极端环境下的应用很有价值。然而，由于涉及前体的相变，其合成具有挑战性。研究了反应烧结和退火时间对相形成、晶粒生长和材料稳定性的影响。结果表明：HP制得的Cr₃AlB₄相含量在 %以上，但长时间退火导致其分解为Cr₃B₄，导致微观组织变化和晶粒开裂。开裂是由于Cr₃AlB₄和其他相之间的热膨胀系数的差异，导致冷却过程中的应力积累。为了优化合成工艺，该研究建议控制晶粒尺寸并使用非反应性烧结添加剂来限制晶粒生长。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.